Weight chart, 8 mm to 32 mm
| Diameter | kg per metre | kg per 12 m rod | Rods per tonne | Metres per tonne |
|---|---|---|---|---|
| 8 mm | 0.395 | 4.74 | ≈ 211 | ≈ 2,530 |
| 10 mm | 0.617 | 7.41 | ≈ 135 | ≈ 1,620 |
| 12 mm | 0.889 | 10.67 | ≈ 94 | ≈ 1,125 |
| 16 mm | 1.58 | 18.96 | ≈ 53 | ≈ 633 |
| 20 mm | 2.47 | 29.63 | ≈ 34 | ≈ 405 |
| 25 mm | 3.86 | 46.30 | ≈ 22 | ≈ 259 |
| 32 mm | 6.32 | 75.85 | ≈ 13 | ≈ 158 |
Weights from d² ÷ 162 (steel at about 7,850 kg/m³). The nominal masses in IS 1786 agree within about 0.2% (12 mm: 0.888 kg/m); actual bars vary slightly within the tolerance the standard allows.
From our team
Notes, photos and examples added by the M&B Chetty team, with the author and the date.
The d²/162 rule
Steel weighs 7,850 kg per m³. A bar of diameter d mm has a cross-section of π × d² ÷ 4 mm², so one metre weighs 7,850 × π × d² ÷ 4,000,000 kg, which simplifies to almost exactly d² ÷ 162.
- 12 mm: 144 ÷ 162 = 0.889 kg/m
- 16 mm: 256 ÷ 162 = 1.58 kg/m
- In feet: a 12 m rod is about 39.4 ft long.
Price per rod and per kg
Steel is quoted per kg or per tonne, but bar-bending schedules count rods. Price per rod = price per kg × rod weight; for 12 mm that is the price per kg × 10.67.
- 12 mm TMT, per kg: ₹56.85 per kg
- 12 mm TMT, per 12 m rod: ₹607 per 12 m rod
- GST: 18% on steel bars.
TMT bars come direct from factories in Gummidipoondi SIPCOT and other plants and are stocked at our six yards. We deliver from the nearest yard holding your diameters.
| Item | Typical quantity | In loads / units |
|---|---|---|
| Results appear here (JavaScript is needed for the calculator). | ||
Typical estimate: Weight per metre = d² ÷ 162 kg (the standard figure for steel bars). The value uses our wholesale yard price per kg for that diameter, before 18% GST and delivery, when the price list has one.
Enter diameter and either rods or metres. When a TMT price is published, the calculator also shows the material value before GST.
How much steel a house takes
The common rule for RCC-framed houses is 3.5–4.5 kg of steel per sq ft of built-up area, so 3.5–4.5 tonnes per 1,000 sq ft. Slabs mostly use 8 and 10 mm bars; beams and columns 12–20 mm. The bar-bending schedule from your engineer gives the real split.